| 硫酸盐侵蚀溶液pH值对硅酸盐水泥浆体C-(A)-S-H凝胶结构的影响 |
| |
| 引用本文： | 张晓佳,张高展,孙道胜,刘开伟,程星星,王月明. 硫酸盐侵蚀溶液pH值对硅酸盐水泥浆体C-(A)-S-H凝胶结构的影响[J]. 复合材料学报, 2019, 36(2): 441-449. DOI: 10.13801/j.cnki.fhclxb.20180427.001 |
| |
| 作者姓名： | 张晓佳 张高展 孙道胜 刘开伟 程星星 王月明 |
| |
| 作者单位： | 1.安徽建筑大学 材料与化学工程学院, 合肥 230601; |
| |
| 基金项目： | 安徽建筑大学先进建筑材料安徽省重点实验室开放课题（JZCL201601ZZ）；国家自然科学基金（51578004；51778513；51608004）；国家重点研发计划"重点基础材料技术提升与产业化"重点专项课题（2017YFB0310001） |
| |
| 摘 要： | C-（A）-S-H凝胶的结构不仅受水泥基材料自身组成的影响，更受其所处环境的影响。本文利用固体核磁共振（NMR）并结合去卷积技术，探究硫酸盐侵蚀溶液pH值对硅酸盐水泥浆体中C-（A）-S-H凝胶结构的影响。结果表明:硫酸盐侵蚀过程中，前期进入凝胶中的Al3+后期又会脱出，使凝胶中四配位铝（Al[4]）/Si比值降低。侵蚀溶液pH值的降低促进了凝胶中Al[4]的脱出，使Al[4]的峰位向负值移动；同时也促进了[SiO4]（[AlO4]）四面体间的聚合，使C-（A）-S-H凝胶平均分子链长（MCL）增加。此外，侵蚀溶液pH值的降低，促进了浆体的水化，但抑制了浆体中钙矾石（AFt）的生成。
|
| 关 键 词： | 硫酸盐侵蚀 C-S-H凝胶 pH值 Al[4]/Si 平均分子链长 |
| 收稿时间： | 2018-02-02 |
Effect of pH-value of Na2SO4 solution on the structure of C-(A)-S-H gels in Portland cement pastes |
| |
| ZHANG Xiaojia,ZHANG Gaozhan,SUN Daosheng,LIU Kaiwei,CHENG Xingxing,WANG Yueming. Effect of pH-value of Na2SO4 solution on the structure of C-(A)-S-H gels in Portland cement pastes[J]. Acta Materiae Compositae Sinica, 2019, 36(2): 441-449. DOI: 10.13801/j.cnki.fhclxb.20180427.001 |
| |
| Authors: | ZHANG Xiaojia ZHANG Gaozhan SUN Daosheng LIU Kaiwei CHENG Xingxing WANG Yueming |
| |
| Affiliation: | 1.School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China;2.Anhui Key Laboratory of Advanced Building Materials, Hefei 230022, China |
| |
| Abstract: | C-(A)-S-H gels are not only affected by the composition of cement-based materials, but also affected by the environment. The effect of pH-values of Na2SO4 solution on the structure of C-(A)-S-H gels was studied by solid-state nuclear magnetic resonance (NMR) with deconvolution technique. The results show that the Al[4]/Si value of C-(A)-S-H gels decreases in sulfate attack process, due to Al3+ entering into gel early and coming out later. The decrease of the erosion solution pH value promotes the migration of Al[4] from C-S-H gels, which leads to the peak position of Al[4] shifting to a negative value. It is found that the average molecular chain length (MCL) of C-S-H gel increases due to the polymerization among[SiO4] ([AlO4]) tetrahedra. In addition, the degree of hydration of the pastes is improved with the decrease of the pH-value, which is not favorable to formation of AFt. |
| |
| Keywords: | sulfate attack C-S-H gel pH-value Al[4]/Si average molecular chain length |
|
| 点击此处可从《复合材料学报》浏览原始摘要信息 |
|
点击此处可从《复合材料学报》下载免费的PDF全文 |
